Chromotrope.



H. M. GIBSON.

CHROMOTROPE.

' APPLICATION r|LED1uNE16.1915.

Patented May 9, 1916.

\ advertising purposes.

` e Lisaeg* HUMPHREY M. GIBsoN, or

CHICAGO, ILLINOIS, AssIGNoR or ONE-HALF To HANS von eon'rz, on CHICAGO,ILLINOIS.

" CHROMOTROPE.

` To'aZZ wliom 'it may concern:

Be it known that I, HUMPHREY M. GIB- soN, a citizen of the UnitedStates, residing at Chicago, inthe county of Cook and State of Illinois,have invented certain new and e useful Improvements in` Chromotropes, of

which the following is a specification. f

This invention contemplates certain improvements in chromotropes andactuating used for mechanism therefor, such as are The objects of theinvention `are to provide in a` chromotrope one or more transenlargedvertical section.

lucent diskswhich will 4 revent the observer from seeing the electric`light within the casing; to provide improved rineans comprising`peripherally grooved rollers for i `supporting and rotating the disks;to provide a protective peripheral binding for each disk to engage withthe said supporting rollers; and to provide improved means for drivingtherollers to rotate the disks in opposite directions. y

In the accompanying drawings, Figure 1 is a front elevation of a deviceembodying the features of my invention. Fig. 2 is an Fig. 3. is a verl etical'section taken" ina plane at right angles to Fig. 2. Fig. Zlis afragmental plan view showing the disk-supporting rollers and the drivingmeans therefor. n

The device comprises a casing 5 `having in opposite sides circular`openings 6 which may, if desired,"beiclosedv by panes oftransparent`glass 7.` Located within the casing behind each of the openings 6 is apair of y disks 8, preferably of glass, each disk havfio ing anornamentation ofl suitable color and design, so that when* the disksarel rotatedi'n opposite directions, `a variety of ,color effects willbe produced, asis well known. Between `the two pairs of disks is asuitable electric light fixture 9 carrying one or more klamps `10 bywhichthe disks 8 are illuminated. The inner disk of each pair is madetranslucent, as by frostingits inner face, so as to prevent the observerfrom seeing `the ylamps 10. `The outer disk of each pair is of clearlglass so that the design upon the inner disk may be seen.

`In the bottom of the casing is a closed box or support 11 in which isrotatably mounted 'a pair of horizontal shafts 12, one

i Specification QfLettersrPatent. 'i

Patented May 9, 1916.

shorter than the other. Each of these shafts l has fixed on oppositeends two rollers 13 having V-grooves in their peripheries. The rollerslie in the different vertical planes of the disks 8 and the latter aresupported and driven by said rollers. Each of the disks 8 has aperipheral protective binding 14 of metal or other` suitable materialand the weight of the'disks acts to cause the binding to wedge in theperipheral groove of the roller so that a firm driving contact betweenthe roller and the disk will be effected.-

`The disks are additionallyl guided or supported by grooved guides 15located atopposite edges of the disks in a plane above the drivingrollers 13.

A drive-shaft 16 is mounted in the support or box 11 at right angles tothe shafts 12 and is driven by an electric motor 17. Said drive-shafthasl two worms 18 thereon meshing with worm-wheels 19 on theirrespective shafts 12. The disks are dierentially rotated; in thisinstance the worms and worm-wheels are pitched in opposite directions,so that the two shafts 12 will be oppositely rotated. The box 11 may befilled with a lubricant, if desired.

Obviously, one of the openings 6 and one pair of disks 8 and supportingrollers 13 may be omitted and the casing 5 narrowed correspondingly, ifdesired.

I claim as my invention :V

1. A device of the character described comprising a casing having anopening therein, a pair of vertical circular disks positioned within thecasing behind said opening, leach disk having any ornamentation thebinding on said disks resting in said grooves, means for additionallyguiding or supporting said disks, and means for driving said shafts inopposite directions.

2. A device of the class described coinprising two rotary vertical diskspositioned 'ingbehind-said disks, thedisk'next to the side by side andeach having a suitable ornathe observer from seeing said lamp, andmentation thereon, a casinginclosing said means for differentiallyArotating said disks. disks and having an opening thru'gh which Intestimony WhereoQI hereuntok set my l0 the disks are visible, a lampWithin the eas- Wha-nd in the presence of a Witness. l

- f 3 HUMPHREY M. GIBSON. opening being of transparent material and-vIn-the'preseneeofthe other disk being translucent to prevent C. PAULPARKER.

copie; ofjthlis patent may be qbtaned forrve leents` each, by addressingthe Commissioner Yof Patents, l Y Y W Y V'Washingt'om20.0." f Y* Y

